All Purchase Order approval access to be given to one user

There is a requirement from the business that only one user is set up with access to approve/reject/reassign/delegate or withdraw any purchase order despite the user being the approver or not the approver at that certain point in time. Is there any current capability to give this access to only one user in the business so that he or she has the ability to access any purchase order approval workflow and make changes.

Appreciate a quick response as the system is not allowing to raise and SR and forcing to post a cloud customer connect.